Here is a Great Solution for peanuts in cost.
Had the same crappy running, gas leaking fire hazzard of a 2 bbl carb on my 69 318. Swapped it out to an Edlebrock 1406 using this 20.00 4 bbl adapter that you can get through AdvanceAutoParts, using the same stock 2 bbl intake manifold that came factory on the car.
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You will see here that the 4 mount holes to your 2 barrel manifold have been machined down with a tool on your drill press. This gives enough clearance so the carb butterflies don't hit the mounting bolt heads. You can mount the 4 bbl carb directly to this without a spacer plate.
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'69 318 stock 2 bbl intake manifold with Mr. Gasket 4 bbl adapter.
Easy 25 horse power upgrade, runs so nice, starts great with electric choke, and you have the secondaries to play with for more performance.
Makes a whole new car out of it, and don't have to change the intake manifold or camshaft.
It really Pulls, I am very impressed . . . 273s are Great Engines too, It gives the engine the fuel that it needs !
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You will need this Edelbrock Mopar Bracket # 1481 to hook up your throttle cable to the carb in the correct geometry. It puts things in place if you have the automatic kickdown also.
Just add the Carb and you are good to go.
Enjoy, happy sailing . . .